"The only known planetary process that creates large-scale
linear boundaries is tectonism, in which internal processes cause
portions of the crust to fracture and sometimes move either up,
down or sideways. Erosion by fluids may accentuate the tectonic
fabric by depositing dark materials in low areas and enlarging
fractures. This interplay between internal forces and fluid erosion
is very Earth-like."
Source: Dr. Alfred McEwen, Cassini imaging team
member from the University of Arizona, Tucson, who theorizes
Saturn's largest moon was shaped by many of the same forces that
shaped our own Earth.
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